Rotor for a vane cell adjuster of a camshaft adjusting device

Abstract

A rotor (1) for a vane cell adjuster of a camshaft adjusting device including a central through opening (10) and at least one radially outwardly projecting vane (2). The rotor (1) is made of at least two parts, an inner part (8) made of a first material and an outer part (3) made of a second material and which surrounds, from the outside, the inner part (8). The first material has a higher strength than the second material, and the inner part (8) is connected in a positive fit in the rotational direction of the outer part (3) by an outer form which is irregular in the cross-section to the rotational axis (14) of the rotor (1).

Claims

1. A rotor for a vane cell adjuster of a camshaft adjusting device, the rotor comprising: an inner part made from a first material, an outer part made from a second material, a central passage opening in the inner part, the inner part having at least one opening arranged radially outside of the central passage opening and adapted to hold a locking pin of a locking device, at least one vane projecting radially outward on the outer part, the outer part surrounding an entire radial outer surface of the inner part, the first material has a higher strength than the second material, and the inner part is connected by a positive fit to the outer part in a rotational direction by an exterior shape that is non-circular in cross-section relative to a rotational axis of the rotor.

2. The rotor according to claim 1, wherein the first material is steel and the second material is a temperature-resistant plastic.

3. The rotor according to claim 1, wherein the inner part has an exterior that is a parallelogram shape in a plane perpendicular to the rotational axis of the rotor.

4. The rotor according to claim 3, wherein the inner part is oriented relative to the outer part such that a longitudinal axis of the inner part runs through centers of two opposite vanes and through the at least one opening.

5. The rotor according to claim 4, wherein the at least one opening includes two openings arranged diametrically opposite relative to the rotational axis of the rotor for holding two locking pins of a locking device, and the two openings are arranged such that centers thereof lie on the longitudinal axis of the inner part with the greater length.

6. The rotor according to claim 1, wherein the inner and outer parts each have pressurized medium channels that are connected to each other in terms of flow in an orientation of the outer part relative to the inner part predefined by the exterior shape of the inner part.

7. The rotor according to claim 1, wherein the inner part has a structured surface with an increased coefficient of friction.

8. The rotor according to claim 1, wherein mass-reducing cut-outs are provided on the outer part.

9. The rotor according to claim 8, wherein the outer part is reinforced in an area of the cut-outs by a separating wall.

10. The rotor according to claim 9, wherein the separating wall divides the cut-outs into two equal-size side pockets.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Below, the invention is explained in more detail with reference to a preferred embodiment. Shown in detail in the figures are:

(2) FIG. 1 a rotor according to the invention in perspective view,

(3) FIG. 2 a rotor according to the invention in section view, and

(4) FIG. 3 a rotor according to the invention in front view.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(5) In the figures, a rotor 1 can be seen that comprises an inner part 8 and an outer part 3. The inner part 8 is formed by a steel sintered part with a high strength, while the outer part 3 is formed by a plastic that is dimensionally stable up to temperatures of 150 degrees Celsius with a lower strength and a lower specific weight. The outer part 3 is formed by a plastic injection molding around the inner part 8 and reduced in mass by multiple cut-outs 6 and 7. The cut-outs 6 and 7 are each divided by a central separating wall 11 into two equal-size side pockets 12 and 13.

(6) The inner part 8 has a central passage opening 10 and two diametrically opposite openings 9 radially outside of the passage opening 10. The inner part 8 has a parallelogram-like or diamond-like exterior shape, so that due to the central passage opening 10 that is circular in cross-section, opposite sections with a thicker wall thickness are created in which the openings 9 are arranged.

(7) The outer part 3 comprises multiple radially outward extending vanes 2 that each separate oppositely acting work chambers in a not-shown stator. The vanes 2 each have two lateral surfaces 5 that are used for transmitting force from the pressurized medium in the work chambers to the rotor 1. Furthermore, the vanes 2 have, radially outside, a sealing surface 4 with which the vanes 2 contact an opposite sealing surface of the stator. Between the vanes 2, the outer part 3 has radial bearing surfaces 15 by which the rotor 1 is supported on stator-fixed, radially inward extending projections that form, on their side, stationary partition walls of the work chambers.

(8) The diamond-like inner part 8 is positioned and oriented in the outer part 3 such that longer longitudinal axis 16 of the inner part 8 connecting the centers of the openings 9 and the passage opening 10 runs through the centers of two opposing vanes 2, while the perpendicular shorter longitudinal axis 17 also runs through the centers of two opposing vanes 2.

(9) The adjustment of the rotor 1 with the attached camshaft is realized in a known way by a pressurized medium charging of the work chambers on one side of the vanes 2. Through the irregular or non-circular, in this case, diamond-like form of the inner part 8, the forces acting here are transmitted with a positive fit from the outer part 3 to the inner part 8, wherein the force transmission or the connection of the outer part 3 and the inner part 8 can be further increased or reinforced by a structured surface with increased coefficient of friction for the inner part 8 and/or the outer part 3.

(10) In the outer part 3 there are multiple cut-outs 6 and 7 that are each divided by a central separating wall 11 into equal-size side pockets 12 and 13. In this way, the outer part 3 is reinforced relative to the radial forces acting on the radially outer surfaces 4 and the circumferential forces acting between the inner part 8 and the outer part 3. The cut-outs 6 on the vanes 2 that border the tips of the diamond-like inner part 8 are provided only in the vanes 2, while the cut-outs 7 of the vane 2 extend laterally up to below the bearing surfaces 15 of the rotor 1 on the flat sides of the diamond-like inner part 8.

(11) The openings 9 in the inner part 8 for holding the locking pins are arranged so that their centers are on the longitudinal axis 16 of the parallelogram-shaped inner part 8 with the greater length that runs through the center of the passage opening 10. Furthermore, the inner part 8 is oriented relative to the outer part 3 so that the longer longitudinal axis 16 runs through the centers of two opposite vanes 2. In this way, the cut-outs 6 and 7 can have identical shapes in a paired arrangement and can be symmetrical themselves and also relative to the longitudinal axes 16 and 17, so that the rotor 1 and especially the outer part 3 has a stiffness that is independent of the rotational direction.

LIST OF REFERENCE NUMBERS

(12) 1 Rotor 2 Vane 3 Outer part 4 Sealing surface 5 Side surface 6 Cut-out 7 Cut-out 8 Inner part 9 Opening 10 Passage opening 11 Separating wall 12 First pocket 13 Second pocket 14 Rotational axis 15 Bearing surface 16 Longitudinal axis 17 Longitudinal axis